the radius of the inner boundary of a plane circular ring is 14 cm. The area of the ring is 346.5 sq.cm. find the radius of the outer boundary
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Area of the inner ring = πr²
=22/7×14×14
=616 cm²
∴, area of the total ring = 346.5+616= 962.5 cm²
∴, πr²=962.5
or, r²=962.5×7/22
or, r²=6737.5/22
or, r²=306.25
or, r=17.5 cm Ans.
=22/7×14×14
=616 cm²
∴, area of the total ring = 346.5+616= 962.5 cm²
∴, πr²=962.5
or, r²=962.5×7/22
or, r²=6737.5/22
or, r²=306.25
or, r=17.5 cm Ans.
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